How many squares, of any size, can you find on this chess board which do not contain a Rook?
Puzzle Copyright © Kevin Stone
Hint: The largest square is 4x4 small squares.
Answer: There are 110 squares without a rook.
There are 60 squares of size 1x1.
There are 35 squares of size 2x2.
There are 12 squares of size 3x3.
There are 3 squares of size 4x4.
A total of 60 + 35 + 12 + 3 = 110.
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